Well cementing shoe



Nov. 7, 1939. R. c. 'AKER WELL CEMENTING SHOE Filed Dec. 12, 1938 yvy ii if!!! III!!! I Illllllll!!! I I INVENTOR. v REUBEN CBAKEQ BY -6?zceuu Q\%ZZ;K

I ATTORNEY Patented Nov. 7, 1939 "UNITED STATES PATENT OFFICE WELL CEMENTING SHOE Reuben C. Baker, Coalinga, Calif., assignor to Baker Oil Tools, Inc., Huntington Park, Calif., a corporation of California Application December 12, 1938, Serial No. 245,235

4 Claims. (Cl. 166-9) This invention relates to apparatus employed during the drilling of oil wells.

It is the principal object of thapresent inven tion to improve the construction of cementing 5 shoes for well casings by incorporating therein a simple and inexpensive means insuring equal distribution of thewcement around the shoe as it discharges therefrom and thereby prevent channeling of the cement inthe annular space between the casing and the bore.

One form which the invention may assume is exemplified in the following description and illustrated by way of example in the accompanying drawing, in which l5 cementing'shoe embodying the preferred form of my invention.

Fig.2 is a bottom view thereof. Referring more particularly to the accompanying drawing, Ill indicates a, casing shoe which in efiect is a cylindrical steel member, adapted to be attached to the lower end of a string of well casing as in standard practice. Within the shoe is cast a concrete or cementitious plug H, the lower end of which is rounded to form a guide [2. Secured concentrically within this plug ,H is a tube [4 formed of aluminum or other drillable material. Preferably this tube is anchored into the concrete plug II and it forms a pas- 80 sageway therethrough.

In the present instance I have shown the de- I vice as being a guideshoe not fitted with a backpressure valve. However, it is obvious that the present invention is applicable to float shoes an 88 cementing shoes of all'characters.

Securely fastened within the tube I4 is a spiral assembly l5 formed of cast aluminum or any othersuitable drillable material. This spiral assembly l5 consists of three blades spirally formed 4 toform spiral passageways in the tube I4, adjacent its lower end sothat as fluid is discharged downwardly under pressure through the tube I4, it will assume a spiral motion as it emerges from the bottom of the tube, and thereby insure equal '45 distribution of the cement in the well bore.

This is very advantageous because if the cement is not equally distributed around the shoe, channels are liable to occur in the cement after it is set through which water may migrate. By

Fig. 'l-is a view in elevation and section of a therethrough a whirling motion as it emerges my present invention I have provided a very simple and inexpensive medium for accomplishing the equal distribution of the cement around the shoe and which I have found to be very efficient in operation. 5

'While I have shown the preferred form of my invention, it is to be understood that various changes may be made in its construction by those skilled in the art without departing from the spirit of the invention as defined in the appended 10 claims.-

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

' 1. In combination with a casing shoe, a guide member secured thereto and having a central l5 passageway formed longitudinally thereof, means in-said passageway dividing said passageway into a plurality of relatively steep spirally directed ,passages to give fluid discharged downwardly therefrom.

2. In combination with a casing shoe, a plug secured therein and having a central longitudinal passageway, spiral blades fixed in said passageway to divide the same ino a plurality of relatively steep helical passages to impart a spiral motion to fluid forced downwardly therethrough as it emerges from said passageway.

3. In combination with a casing shoe; a cementitious plug cast therein, a tube secured to said plug and extending longitudinally thereof and forming a passageway therethrou'gh, said pessageway being divided into a plurality of relatively steep helical passages to impart a whirling motion to fluid pumped downwardly therethrough."

4. In combination with a casing shoe, a cementitious plug cast therein and being formed with a guide-shaped lower end, a tube of drillable material secured concentrically of said plug and ex-Nb tending longitudinally therethrough, a'plurality -of blades of drillable materialqsecured in said tube, the outer marginal edges of said blades bearing against the-inner circumference of said tube and dividing the interior of said tube into a plurality of relatively steep spiral passageways to give fluid pumped downwardly through said tu a whirling motion as it emerges from the tube.-

REUBEN c. BAKER. 

